High-pressure gas-compressor.



E. PRESTAGE. HIGH PRESSURE GAS COMPRESSOR.

APPLICATION FKLED OCT. 23. I914.

Patented Jan. 11; 1916.

Irma/17hr ltlldl 'Q ED dTAfiLlES PATENT current EDWIN PRESTAGE, 01ESTOKE NEWINGTON, LONDON, ENGLAND.

HIGH-PRESSURE GAS-COMPRESSOR.

Application filed October 23, 1914.

To all whom it may concern Be it known that l, EDWIN PRESTAGE, a subjectof the King of Great Britain, residing at 7a Rectory road, StokeNewington, inthe county of London, England, have invented new and usefulImprovements in and Relating to High-Pressure Gas-Compressors, of whichthe following is a specification.

My invention relates to improvements in high pressure gas compressors,designed more particularly for compressing ammonia or carbonic acid gasfor refrigerators.

Those high pressure compressors now in usefor the purpose of compressingammonia or carbonic acid gas rarely work at a pressure below a hundredpounds per square inch, such compressors have been fitted with mushroomvalves, with the result that idnily compressors with a. slow pistonspeed can used satisfactorily owing to the valve slipoccasioned with thehigher piston speeds.

My invention is designed to provide means whereby such high pressurecompressors can be economically worked with safety at a high pistonspeed. i

My invention comprises the use in' a high pressure compressor of asleeve valve arranged between the piston and the cylinder andreciprocated in a partly contrary direction to the direction of thepiston.

According to my invention a series of gas inlets or ports are spacedaround the wall of the cylinder or liner, and a series of ports in thesleeve valve are adapted to register in one position of said valve withsaid gas inlets, while the gas outlets are arranged above said gasinlets in the cylinder head. The said gas out-lets comprise a series ofchannels cored out on the inner surface of the sleeve valve and formingthe outlet ports from the cylinder leading to a gas chamber of-largearea. These outlet ports are combined with packing rings adapted torevent the gas from leaking over the top 0 the sleeve valve or back intothe cylinder and thus relieving the top and outer surface of said sleevefrom head. pressure, while'owing to suchchannel outlet ports beingarranged parallel with the Specification of Letters Patent.

Patented Jan. ill, 1916.

Serial no. 868,310.

axis of the sleeve there is no sudden change of direction of flow of thecompressed gas passing through said outlets from the-cylinder, thuspreventing a waste of energy through the heatin of the gas during itsgas inlets 17 are arranged, said inlets connecting the annular chamber16 with the cylinder. The sleeve valve 5 is provided with correspondingseries of ports 18 adapted to register in one position of the sleevevalve with said gas inlets 1'7.

1 indicates the gas discharge outlet; 2 indicates a gas chamber oflarge'area above the false head 3 of the cylinder which is retained inposition by the spring 4 which rests upon the guide webs 11. The sleevevalve 5 has a series of channels (3 cored out on the inner surface ofsaid sleeve. These channels form outlet ports from the cylinder and leadto passages 7 opening into the said chamber 2, but closed by the valveformed by the ring 8 shown more particularly in Fig. 2, the said ringbeing pressed down against the orifice of the said passages 7 by meansof springs 9 and pins 10 mounted in slotscut in the said guide. webs 11projecting from the false head 3.

It will be obvious that when com resend gas is admitted to the passages?through the channels 6 ofthe sleeve valve 5 the pres sure of the gaswill lift said ring 8' against the pressure at the springs 9 and'thusallow the passage'of the gas into the chamber 2 which i s-9fcomparatively-large area, withspindle of said cylinder out any suddenchange of direction of flow during the passage of the gas from thecylinder.

12 indicates an annular lead washer for holding the liner 13 in placeand preventing it from rocking during the reciprocation of the sleevevalve 2.

14 indicates a packing ring for preventing the gas from leaking over thetop of the sleeve valve and 15 indicates a packing ring for preventingthe gas from leakingback into the cylinder.

The false head 3 fits loosely in the cylinder and projects into thesleeve valve, while the outlet ports or channels 6 cored out on theinner surface of said sleeve valve are the false head.

The sleeve valve 5 is conveniently provided at its lower end (not shown)with an extending lug on which is mounted a spindle on which ispivotally mounted a head carrying a strap encircling an eccentriccarried by a web of the engine crank shaft. It must be understoodhowever, that the exact method of reciprocating the sleeve valve 5 maybe varied and forms no part of the present invention.

What I claim is 2 1. A high pressure compressor for ammonia or carbonicacid gas comprising a cylinder with a series of gas inlets spaced aroundits wall, a piston reciprocating in said cylinder, a sleeve valvereciprocating between the piston and the cylinder with a series of portsadapted to register with said gas inlets in one position of said valveand with gas outlet passages on the inner surface of said sleeve valveadapted to register with the cutoff ed e of a. cylinder head projectinginto said s eeve valve.

2. A high pressure compressor for ammonia or carbonic acid gascomprising a cylinder with a series of gas inlets spaced around itswall, a piston reciprocating in said cylinder, a sleeve valvereciprocating between the piston and the cylinder with a series of portsadapted toregister with said gas inlets in one position of said valve, aseries of channels cored out on the inner surface of the upper end ofsaid sleeve valve adapted to form gas outlet passages from saidcylinder, a false head in the top of said cylinder projecting into saidsleeve valve and provided with ports registering with the channels insaid sleeve valve and leading to a gas chamber above said false head.

3. A high pressure compressor for ammonia or carbonic acid gascomprisinga cylinder with a series of gas inlets spaced around its wall,a piston reciprocating in said cylinder, a sleeve valve reciprocatingbetween the piston and the cylinder with a series of ports adapted toregister with said gas inlets in one position of said valve, a series ofchannels cored out on the inner surface of the upper end of said sleevevalve adapted to form outlet passages from said cylinder, a false headin the top of the said cylinder projecting into said sleeve valve withports registering with the channels in said sleeve valve and leading toa gas chamber above said false head and packing rings adapted to preventthe gas from leaking over the top of said sleeve valve back into saidcylinder.

4;. ,A high pressure compressor for ammonia or carbonic acid gascomprising a cylinder with a series of gas inlets spaced around itswall, a piston reciprocating in said cylinder, a sleeve valvereciprocating between the piston and the cylinder with a series of portsadapted to register with said gas inlets in I one position of saidvalve, a series of channels cored out on the inner surface of the upperend of said sleeve valve parallel with the axis of said sleeve valve andadapted to form outlet passages from said cylinder, a false head in thetop of said cylinder projecting into said sleeve valve with portsregistering with the channels in said sleeve valve and leading to a gaschamber above said false head, and packing rings adapted to prevent thegas from leaking over the top of said sleeve valve back into saidcylinder.

5. A high pressure compressor for ammonia or carbonic acid gaseomprisinga cylinder with a series of gas inlets spaced around its wall,a piston reciprocating in said cylinder, a sleeve valve reciprocatingbetween the piston and the cylinder with a series of ports adapted toregister with said gas inlets in one position of said valve, a series ofchannels cored out on the inner surface of the upper-end of said sleevevalve adapted to form outlet passages from said cylinder, a

false head in the top of the cylinder projecting into said sleeve valvewith ports registering with the channels -in said sleeve valve andleading to a gas chamber above said false head and a springcontrolled-ring closing the orifices of'the ports opening into the gaschamber through said false head.

6. A high pressure compressor for ammonia or carbonic acid gascomprising a cylinder with a series of s inlets spaced around its wall,a piston reciprocating in said cylinder, a sleeve valve reciprocatingbetween the piston and the cylinder with a series of ports adapted toregister with said gas inlets in one position of said valve, a series ofchan-.

jecting into said sleeve valve with ports staring with the channels insaid 312 ove. in testimony whereof I have signed my '1 ii-ildliilg to agas chamber above name to this speclficatlon 1n the presence of 10 a mugcontrolled rung two subscnbmg WHLIXOSSBS.

EDWIN PRESTAGF.

port-s opening into closing the, on. oi, Lu

M Q 1h and so head and out the gas Witnesses:

said sleve. Lxmomm HAYNES,

H. W K. JENNINGS.

